How many Xs to end a sentence?

I haven't checked the bastion of mental masturbation that is also called "mASF", but recently someone gave me a link to what it one of the most ludicrous posts I have read in a long time.

Some seasoned veteran who has registered well over two years ago writes:

I was wondering for a while how you guys calibrate the xxx at the end of txt messages. I might just be overthinking this stuff but I would like to hear your opinion.
x = not really interested
xx = interested
xxx = really interested
kiss = interested

This is my opinion on this matter. Why do you use a single X or sometimes two xx? What's your experience with this overall? What has gotten the 'best' responses?

 Wow.